题目内容：
请回答21 题。
参考答案：
答案解析：
单选题：请回答21 题。
- 题目分类：中级
- 题目类型：单选题
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EXONERATE:
EXONERATE:
The passage provides information that would answer which of
The passage provides information that would answer which of the following questi
The primary purpose of the passage is to
The primary purpose of the passage is to
DOUBT : QUESTION::
DOUBT : QUESTION::
上海证券交易所买断式回购的履约金制度与银行间市场的保证金或保证券制度的初衷相比还有其自身的特点，如（ ）。
上海证券交易所买断式回购的履约金制度与银行间市场的保证金或保证券制度的初衷相比还有其自身的特点，如（ ）。